Escalator cleaning device
FIELD OF THE INVENTION 
     This invention relates to cleaning devices, more particularly to devices for automatically cleaning escalators, travelators, hereinafter reference being made for convenience to escalators only. 
     DESCRIPTION OF THE PRIOR ART 
     Presently, cleaning of escalators is a difficult, expensive and inconvenient task, requiring escalators to be temporarily taken out of service and cleaned manually. This is time consuming, laborious and expensive. 
     SUMMARY OF THE INVENTION 
     The present invention overcomes this problem broadly by providing an escalator cleaning device comprising brush means adapted to cover the tread of an escalator, frame means supporting said brush means, and means on said frame means to engage the side walls of said escalator whereby to support said device in place. 
    
    
     BRIEF REFERENCE TO THE DRAWINGS 
     A better understanding of the invention can be gained by reference to the accompanying drawings in which: 
     FIG. 1 is a perspective view of the cleaning device of the invention; 
     FIG. 2 is a plan view of said device; and 
     FIGS. 3 and 4 are respectively end and side elevation views. 
    
    
     DETAILED DESCRIPTION OF THE DRAWINGS 
     In the drawings is shown an automatic escalator cleaning device having a flat platform like portion 1, equipped with bristle or brush means 2 underneath. The preferred bristle types are marketed under the trade name TYNEX which is a nylon bristle including metallic chips or fibers. A frame is used to clamp platform 1 in place on an escalator between the side walls thereof. 
     The frame comprises a pair of arms 3, connections 3a , a bar and a pair of end blocks 5 mounted on the bar. A frame 6 on platform 1 holds a container 9 which may be filled with a liquid cleaning mixture, e.g. detergent and water. A distributor system for the cleaning mixture comprises pipe means 7 and 8. Pipe means 7 receives the cleaning mixture from container 9 which is provided with valve means 10 (FIG. 3) to control the flow in the pipe means, and then through a series of ample holes in pipe means 8, designated 8a (FIG. 3). 
     In use the device is fitted to an escalator by placing the platform portion over a tread thereof and fixing in place by member (bar) 4 and blocks 5 between the side walls. Blocks 5 may be constructed of wood, hard rubber, or plastic material. In any event, it is preferred that they should have at least a minimal resilience to avoid damage to said side walls. The connectors 3a may be slideable and clampable to assist adjustment to bar 4. As an alteration, bar 4 might be telescopically adjustable. To clean the escalator, the escalator is run while the device is fitted, with the cleaning mixture adjusted to a convenient rate of flow. Rubbish is brushed off the treads and is collected (as usual) in hopper means under the escalator. 
     Finally, it is not necessary that there be means 6 and 9 on the device; a hose supply can be connected directly to pipe means 7 and 8, from a water supply or means providing the cleaning liquid mixture. 
     Some of the bristles 2 (say every 4th or 5th set) may be shortened somewhat whereby contact with the tread is still effected. Furthermore the side bars (arms 3) may be located closer together than is shown in the diagrams. They may be provided with legs whereby the side bars are held to the broom more firmly. 
     It must be emphasized that this invention is to be given a broad connotation and is not limited to the embodiments specifically disclosed.